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https://www.readbyqxmd.com/read/29279766/evaluation-of-marginal-and-internal-gap-of-three-unit-metal-framework-according-to-subtractive-manufacturing-and-additive-manufacturing-of-cad-cam-systems
#1
Dong-Yeon Kim, Eo-Bin Kim, Hae-Young Kim, Ji-Hwan Kim, Woong-Chul Kim
PURPOSE: To evaluate the fit of a three-unit metal framework of fixed dental prostheses made by subtractive and additive manufacturing. MATERIALS AND METHODS: One master model of metal was fabricated. Twenty silicone impressions were made on the master die, working die of 10 poured with Type 4 stone, and working die of 10 made of scannable stone. Ten three-unit wax frameworks were fabricated by wax-up from Type IV working die. Stereolithography files of 10 three-unit frameworks were obtained using a model scanner and three-dimensional design software on a scannable working die...
December 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29258696/residual-stress-of-porcelain-fused-to-zirconia-3-unit-fixed-dental-prostheses-measured-by-nanoindentation
#2
Vinicius P Fardin, Estevam A Bonfante, Paulo G Coelho, Malvin N Janal, Nick Tovar, Lukasz Witek, Dimorvan Bordin, Gerson Bonfante
OBJECTIVE: To evaluate the residual stress (nanoindentation based on hardness) of fatigued porcelain-fused to zirconia 3-unit fixed dental prostheses (FDP) with different framework designs. METHODS: Twenty maxillary 3-unit FDP replacing second-premolar (pontic) were fabricated with conventional framework-design (even-thickness of 0.5mm and 9mm2 connector area) and modified framework-design (thickness of 0.5mm presenting lingual collar connected to proximal struts and 12mm2 connector area)...
December 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29196948/fracture-behavior-of-all-ceramic-implant-supported-and-tooth-implant-supported-fixed-dental-prostheses
#3
Abdul Rahman Alkharrat, Marc Schmitter, Stefan Rues, Peter Rammelsberg
OBJECTIVES: In vitro investigation of the effects of fixed dental prosthesis (FDP) support and loading conditions on the fracture behavior of all-ceramic, zirconia-based FDP veneered with computer-aided design/computer-aided manufacturing (CAD/CAM)-manufactured lithium disilicate ceramic. MATERIALS AND METHODS: Based on a model for a 3-unit FDP in the molar region (tooth in region 15, implant in region 17), 16 identical zirconia frameworks were fabricated and veneered with milled lithium disilicate ceramic...
December 2, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29167359/genome-diversity-in-the-neolithic-globular-amphorae-culture-and-the-spread-of-indo-european-languages
#4
Francesca Tassi, Stefania Vai, Silvia Ghirotto, Martina Lari, Alessandra Modi, Elena Pilli, Andrea Brunelli, Roberta Rosa Susca, Alicja Budnik, Damian Labuda, Federica Alberti, Carles Lalueza-Fox, David Reich, David Caramelli, Guido Barbujani
It is unclear whether Indo-European languages in Europe spread from the Pontic steppes in the late Neolithic, or from Anatolia in the Early Neolithic. Under the former hypothesis, people of the Globular Amphorae culture (GAC) would be descended from Eastern ancestors, likely representing the Yamnaya culture. However, nuclear (six individuals typed for 597 573 SNPs) and mitochondrial (11 complete sequences) DNA from the GAC appear closer to those of earlier Neolithic groups than to the DNA of all other populations related to the Pontic steppe migration...
November 29, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29134032/the-larva-of-adicella-syriaca-including-a-key-to-the-european-larvae-of-adicella-mclachlan-1877-trichoptera-leptoceridae
#5
Johann Waringer, Hans Malicky, Wolfram Graf, Simon Vitecek
Adicella syriaca is a leptocerid caddisfly distributed throughout the Balkan Peninsula, the Carpathians, the Hungarian Lowlands, the Pontic Province, and the Caucasus. This paper describes the previously unknown larva of this species, based on material from the Greek island of Corfu. Information on the morphology of the fifth larval instar is given, and the most important diagnostic features are illustrated. A key to the known larvae of the European species of Adicella McLachlan, 1877 is provided. In the context of existing identification keys, the larva of Adicella syriaca Ulmer, 1907 keys together with Adicella cremisa Malicky, 1972, but the species pair can be easily separated by the number of setae on the pro- and mesonotum, and setation patterns on abdominal dorsum IX...
2017: ZooKeys
https://www.readbyqxmd.com/read/29128350/biomechanical-behavior-of-adhesive-cement-layer-and-periodontal-tissues-on-the-restored-teeth-with-zirconia-rbfdps-using-three-kinds-of-framework-design-3d-fea-study
#6
Ayana Uraba, Reina Nemoto, Kosuke Nozaki, Tasuku Inagaki, Satoshi Omori, Hiroyuki Miura
PURPOSE: To investigate stress and strain concentrations on resin-bonded fixed dental prostheses (RBFDPs) frameworks of different design using finite element analysis. METHODS: A human dry skull was scanned and models were produced using three-dimensional printer. After abutment preparation, three frameworks, including a three-unit RBFDP, and two-unit cantilevered RBFDPs using #21 and #23 for the abutment tooth, were fabricated. Scanned data were subtracted to define boundary of each structure...
November 8, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28874990/in-vitro-study-of-the-fracture-resistance-of-monolithic-lithium-disilicate-monolithic-zirconia-and-lithium-disilicate-pressed-on-zirconia-for-three-unit-fixed-dental-prostheses
#7
Jae-Won Choi, So-Yeun Kim, Ji-Hyeon Bae, Eun-Bin Bae, Jung-Bo Huh
PURPOSE: The purpose of this study was to determine fracture resistance and failure modes of three-unit fixed dental prostheses (FDPs) made of lithium disilicate pressed on zirconia (LZ), monolithic lithium disilicate (ML), and monolithic zirconia (MZ). MATERIALS AND METHODS: Co-Cr alloy three-unit metal FDPs model with maxillary first premolar and first molar abutments was fabricated. Three different FDPs groups, LZ, ML, and MZ, were prepared (n = 5 per group)...
August 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28874989/evaluation-of-marginal-and-internal-gaps-in-single-and-three-unit-metal-frameworks-made-by-micro-stereolithography
#8
Dong-Yeon Kim, Ha-Na Lee, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
PURPOSE: The purpose of this study is to compare single and three-unit metal frameworks that are produced by micro-stereolithography. MATERIALS AND METHODS: Silicone impressions of a selected molar and a premolar were used to make master abutments that were scanned into a stereolithography file. The file was processed with computer aided design software to create single and three-unit designs from which resin frameworks were created using micro-stereolithography...
August 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28866149/three-dimensional-finite-element-analysis-of-occlusal-splint-and-implant-connection-on-stress-distribution-in-implant-supported-fixed-dental-prosthesis-and-peri-implantal-bone
#9
Vívian Dos Santos Marsico, Roberto Brunow Lehmann, Cristiane Aparecida de Assis Claro, Marina Amaral, Rafael Pino Vitti, Ana Christina Claro Neves, Lais Regiane da Silva Concilio
The aim of this study was to investigate the influence of occlusal splint therapy on the stress distribution of implant-supported fixed dental prosthesis (FDP) and peri-implantal bone structures using three-dimensional (3D) finite element analysis (FEA). The system consisted of two implants (positioned on region of second premolar and second molar) as retainers of fixed porcelain-fused-to-metal 3-unit FDP (first molar as pontic element). Two implant connections systems (external and internal hexagon) were tested...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28861254/no-obvious-genetic-erosion-but-evident-relict-status-at-the-westernmost-range-edge-of-the-pontic-pannonian-steppe-plant-linum-flavum-l-linaceae-in-central-europe
#10
Kristina Plenk, Katharina Bardy, Maria Höhn, Mike Thiv, Matthias Kropf
We investigate patterns of genetic variation along an east-west transect of Central European populations of Linum flavum and interpret the Quaternary history of its peripheral populations, especially those at the westernmost isolated range edge, discussing their migrations and possible relict status. We defined our peripheral transect across three study regions from Central Hungary, eastern Austria to southwestern Germany. Using AFLP fingerprinting and cpDNA sequence variation (rpL16 intron, atpI-H), we analyzed 267 and 95 individuals, respectively, representing each study region by four populations...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28833823/precise-reproduction-of-soft-tissue-structure-around-the-pontic-area-using-computer-aided-design-and-manufacturing
#11
Hyeonjong Lee, Janghyun Paek, Kwantae Noh, Kung-Rock Kwon
Reproducing soft tissue contours around a pontic area is important for the fabrication of an esthetic prosthesis, especially in the anterior area. A gingival model that precisely replicates the soft tissue structure around the pontic area can be easily obtained by taking a pick-up impression of an interim fixed dental prosthesis. After a working cast is fabricated using the customary technique, the pick-up model is superimposed onto the working model for the pontic area using computer-aided design and manufacturing (CAD/CAM)...
August 21, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28725128/quality-of-communication-between-dentists-and-dental-laboratory-technicians-for-fixed-prosthodontics-in-riyadh-saudi-arabia
#12
Huda Tulbah, Eman AlHamdan, Amal AlQahtani, Asma AlShahrani, Mona AlShaye
The fabrication of a clinically acceptable dental prosthesis requires proper communication between the dentist and the dental technician. Prosthodontic educators have been concerned with this interaction and communication. Fixed prosthodontics laboratories revealed that the technicians are often dissatisfied with the information provided in work authorizations. OBJECTIVE: To evaluate the quality of communication between dentists and laboratory technicians via work authorizations for fixed prosthodontics in both governmental and private dental laboratories in Riyadh area from the technician's perspective...
July 2017: Saudi Dental Journal
https://www.readbyqxmd.com/read/28703151/predictability-of-resin-bonded-bridges-a-systematic-review
#13
G R Balasubramaniam
Objective The objective of this systematic review is to evaluate the survival rate of resin bonded bridges (RBBs) and understand the relationship between various prognostic factors and survival rate.Methods An electronic medline and hand search were carried out to identify prospective studies on RBBs. Critical appraisal of the studies was done and data was extracted from selected studies. Survival rate was estimated with random effect Poissons regression using R software. Influence of location and luting cements was estimated using odds ratio and forest plots using CMA software...
June 9, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28688950/ten-year-outcome-of-zirconia-ceramic-cantilever-resin-bonded-fixed-dental-prostheses-and-the-influence-of-the-reasons-for-missing-incisors
#14
Matthias Kern, Nicole Passia, Martin Sasse, Christine Yazigi
OBJECTIVES: This clinical study evaluated the long-term outcome and survival rate of all-ceramic cantilever resin-bonded fixed dental prostheses (RBFDPs) made of zirconia-ceramic with a single-retainer design to replace missing incisors. In addition, whether the reason for missing incisors has an influence on the longevity of RBFDPs was analyzed. MATERIALS AND METHODS: One hundred and eight zirconia ceramic cantilever RBFDPs were provided for 87 patients. Seventy-five RBFDPs replaced maxillary incisors and 33 mandibular incisors...
July 5, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28624089/moisture-evaluation-of-%C3%AE-cyclodextrin-fish-oils-complexes-by-thermal-analyses-a-data-review-on-common-barbel-barbus-barbus-l-pontic-shad-alosa-immaculata-bennett-european-wels-catfish-silurus-glanis-l-and-common-bleak-alburnus-alburnus-l-living-in-danube-river
#15
REVIEW
Daniel I Hădărugă, Cristina L Birău Mitroi, Alexandra T Gruia, Virgil Păunescu, Geza N Bandur, Nicoleta G Hădărugă
The moisture content of β-cyclodextrin/Danube fish oils complexes (common barbel, Pontic shad, European wels catfish, common bleak) was evaluated by thermal methods. Saturated and monounsaturated fatty acids were the most concentrated in fish oils (25.3-30.8% and 36.1-45.0%). ω-3 And ω-6 fatty acids were identified in low concentrations of 2.8-12.1% and 4.1-7.1%. The moisture content was significantly lowered after β-CD complexation, as revealed by thermogravimetric (TG) analysis (13.3% for β-CD, 2.5-6...
December 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28533015/in%C3%A2-vitro-comparison-of-the-load-bearing-capacity-of-ceramic-and-metal-ceramic-resin-bonded-fixed-dental-prostheses-in-the-posterior-region
#16
Wolfgang Bömicke, Moritz Waldecker, Johannes Krisam, Peter Rammelsberg, Stefan Rues
STATEMENT OF PROBLEM: The clinical use of ceramic resin-bonded fixed dental prostheses (RBFDPs) in the posterior region is desirable for esthetic and biological reasons but has been associated with many technical problems, including fractures or chipping of the veneer. Although these problems may be overcome by using monolithic zirconia, information is lacking about the load-bearing capacity of resin-bonded monolithic zirconia restorations for replacing a molar. PURPOSE: The purpose of this in vitro study was to compare the load-bearing capacity (Fu), the load at initial damage (F1d), and the failure pattern of posterior RBFDPs fabricated from monolithic zirconia (MZr), veneered zirconia (VZr), and veneered cobalt-chromium (VCo)...
May 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28476765/reply-to-lazaridis-and-reich-robust-model-based-inference-of-male-biased-admixture-during-bronze-age-migration-from-the-pontic-caspian-steppe
#17
Amy Goldberg, Torsten Günther, Noah A Rosenberg, Mattias Jakobsson
No abstract text is available yet for this article.
May 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28462405/monolithic-zirconia-reconstructions-supported-by-teeth-and-implants-1-to-3-year-results-of-a-case-series
#18
Andreas Worni, Joannis Katsoulis, Lumni Kolgeci, Mathias Worni, Regina Mericske-Stern
OBJECTIVE: Today, only scarce information is available on monolithic zirconia reconstructions. The objective of this study was to evaluate the performance of monolithic zirconia for tooth- and implant-borne reconstructions. METHOD AND MATERIALS: Monolithic zirconia single crowns (SCs) and fixed dental prostheses (FDPs) supported by implants or teeth were included in this study. Implant placement and prosthetic treatment were done in the same clinical setting. One technician performed all laboratory work using the same CAD/CAM workflow (DentalDesigner, Ceramill Motion 2, Amann Girrbach)...
April 28, 2017: Quintessence International
https://www.readbyqxmd.com/read/28462018/glacial-allopatry-vs-postglacial-parapatry-and-peripatry-the-case-of-hedgehogs
#19
Barbora Černa Bolfíková, Kristýna Eliášová, Miroslava Loudová, Boris Kryštufek, Petros Lymberakis, Attila D Sándor, Pavel Hulva
Although hedgehogs are well-known examples of postglacial recolonisation, the specific processes that shape their population structures have not been examined by detailed sampling and fast-evolving genetic markers in combination with model based clustering methods. This study aims to analyse the impacts of isolation within glacial refugia and of postglacial expansion on the population structure of the Northern White-breasted hedgehog (Erinaceus roumanicus). It also discusses the role of the processes at edges of species distribution in its evolutionary history...
2017: PeerJ
https://www.readbyqxmd.com/read/28457277/semipermanent-replacement-of-missing-maxillary-lateral-incisors-by-mini-implant-retained-pontics-a-follow-up-study
#20
Roberto Ciarlantini, Birte Melsen
Agenesis of maxillary lateral incisors can be treated either by closing the space and substituting the canines for the missing lateral incisors or, in adults, by replacing the missing teeth with fixed prosthetics or implants. This article illustrates a method that can be used for a semipermanent implant replacement of the missing incisors in adult patients. An Aarhus mini-implant was inserted perpendicular to the palatal mucosa of the alveolar process of the edentulous area. A pontic was made at chair side of composite material around a stainless steel wire extending from the mini-implant...
May 2017: American Journal of Orthodontics and Dentofacial Orthopedics
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